Write-up: This case was reported by a foreign regulatory authority (# 2009-02622) and described the occurrence of pregnancy on oral contraceptive in a 17-year-old female subject who was vaccinated with PRIORIX (GlaxoSmithKline), ENGERIX B adult and GARDASIL (non-GSK). Since April 2008, the subject was under YASMIN without forgetting to take the pill, without co-medication or episode of diarrhea or vomiting. On 23 March 2009, the subject received unspecified dose of PRIORIX (unknown route of administration, lot number not provided). On 27 March 2009, the subject had her last menstruation. On 30 March 2009, the subject received unspecified dose of ENGERIX B adult (unknown route of administration, lot number not provided) and unspecified dose of GARDASIL (unknown route of administration). On 10 April 2009 (estimated date of conception for a regular cycle), the subject was found to be pregnant. On 28 May 2009, the subject received unspecified dose of ENGERIX B adult (unknown route of administration, lot number not provided) and unspecified dose of GARDASIL (unknown route of administration). On 8 June 2009, the subject received unspecified dose of PRIORIX (unknown route of administration, lot number not provided). The regulatory authority reported that the events were clinically significant (or requiring intervention). The regulatory authority reported that the events were possibly related to vaccination with PRIORIX, ENGERIX B adult and GARDASIL and to YASMIN.